Neco Model Questions Vol1 2022 Biology Question 34

Practice objective / multiple choice question 34 from the 2022 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 34 NECO_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A skeletal muscle produces \(5\,\text{mN}\) of force per motor unit at rest. To lift a weight requiring \(0.8\,\text{N}\) of force, how many motor units must be recruited initially? If, after a sustained contraction, each motor unit's force output falls by \(10\%\), how many motor units are required to maintain the lift, and how many additional units must be recruited?

Answer Options

A. Initially 170 motor units; after fatigue 190 units total (20 additional units).
B. Initially 150 motor units; after fatigue 165 units total (15 additional units).
Correct Answer C. Initially 160 motor units; after fatigue 178 units total (18 additional units).
D. Initially 140 motor units; after fatigue 155 units total (15 additional units).
Correct Answer
C
Correct Option:
Initially 160 motor units; after fatigue 178 units total (18 additional units).

About This Question

This is Neco Model Questions Vol1 2022 Biology Question 34. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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